1 /* gpiod.c - gpio tools
2 *
3 * Copyright 2021 The Android Open Source Project
4 *
5 * TODO: gpiomon
6
7 USE_GPIODETECT(NEWTOY(gpiodetect, ">0", TOYFLAG_USR|TOYFLAG_BIN))
8 USE_GPIOFIND(NEWTOY(gpioinfo, 0, TOYFLAG_USR|TOYFLAG_BIN))
9 USE_GPIOGET(NEWTOY(gpioget, "<2l", TOYFLAG_USR|TOYFLAG_BIN))
10 USE_GPIOINFO(NEWTOY(gpiofind, "<1>1", TOYFLAG_USR|TOYFLAG_BIN))
11 USE_GPIOSET(NEWTOY(gpioset, "<2l", TOYFLAG_USR|TOYFLAG_BIN))
12
13 config GPIODETECT
14 bool "gpiodetect"
15 default y
16 help
17 usage: gpiodetect
18
19 Show all gpio chips' names, labels, and number of lines.
20
21 config GPIOFIND
22 bool "gpiofind"
23 default y
24 help
25 usage: gpiofind NAME
26
27 Show the chip and line number for the given line name.
28
29 config GPIOINFO
30 bool "gpioinfo"
31 default y
32 help
33 usage: gpioinfo [CHIP...]
34
35 Show gpio chips' lines.
36
37 config GPIOGET
38 bool "gpioget"
39 default y
40 help
41 usage: gpioget [-l] CHIP LINE...
42
43 Gets the values of the given lines on CHIP. Use gpiofind to convert line
44 names to numbers.
45
46 -l Active low
47
48 config GPIOSET
49 bool "gpioset"
50 default y
51 help
52 usage: gpioset [-l] CHIP LINE=VALUE...
53
54 Set the lines on CHIP to the given values. Use gpiofind to convert line
55 names to numbers.
56
57 -l Active low
58 */
59
60 #define FOR_gpiodetect
61 #define TT this.gpiod
62 #include "toys.h"
63
GLOBALS(struct double_list * chips;int chip_count;)64 GLOBALS(
65 struct double_list *chips;
66 int chip_count;
67 )
68
69 #include <linux/gpio.h>
70
71 static int open_chip(char *chip)
72 {
73 sprintf(toybuf, isdigit(*chip) ? "/dev/gpiochip%s" : "/dev/%s", chip);
74 return xopen(toybuf, O_RDWR);
75 }
76
collect_chips(struct dirtree * node)77 static int collect_chips(struct dirtree *node)
78 {
79 int n;
80
81 if (!node->parent) return DIRTREE_RECURSE; // Skip the directory itself.
82
83 if (sscanf(node->name, "gpiochip%d", &n)!=1) return 0;
84
85 dlist_add(&TT.chips, strdup(node->name));
86 TT.chip_count++;
87
88 return 0;
89 }
90
comparator(const void * a,const void * b)91 static int comparator(const void *a, const void *b)
92 {
93 struct double_list *lhs = *(struct double_list **)a,
94 *rhs = *(struct double_list **)b;
95
96 return strcmp(lhs->data, rhs->data);
97 }
98
99 // call cb() in sorted order
foreach_chip(void (* cb)(char * name))100 static void foreach_chip(void (*cb)(char *name))
101 {
102 struct double_list **sorted;
103 int i = 0;
104
105 dirtree_flagread("/dev", DIRTREE_SHUTUP, collect_chips);
106 if (!TT.chips) return;
107
108 sorted = xmalloc(TT.chip_count*sizeof(void *));
109 for (i = 0; i<TT.chip_count; i++) sorted[i] = TT.chips = TT.chips->next;
110 qsort(sorted, TT.chip_count, sizeof(void *), comparator);
111
112 for (i = 0; i<TT.chip_count; i++) {
113 sprintf(toybuf, "/dev/%s", sorted[i]->data);
114 cb(toybuf);
115 }
116
117 free(sorted);
118 llist_traverse(&TT.chips, llist_free_arg);
119 }
120
gpiodetect(char * path)121 static void gpiodetect(char *path)
122 {
123 struct gpiochip_info chip;
124 int fd = xopen(path, O_RDWR);
125
126 xioctl(fd, GPIO_GET_CHIPINFO_IOCTL, &chip);
127 close(fd);
128
129 // gpiochip0 [pinctrl-bcm2711] (58 line)
130 printf("%s [%s] (%u line%s)\n", chip.name, chip.label, chip.lines,
131 chip.lines==1?"":"s");
132 }
133
gpiodetect_main(void)134 void gpiodetect_main(void)
135 {
136 foreach_chip(gpiodetect);
137 }
138
139 #define FOR_gpiofind
140 #include "generated/flags.h"
141
gpiofind(char * path)142 static void gpiofind(char *path)
143 {
144 struct gpiochip_info chip;
145 struct gpioline_info line;
146 int fd = xopen(path, O_RDWR);
147
148 xioctl(fd, GPIO_GET_CHIPINFO_IOCTL, &chip);
149
150 for (line.line_offset=0; line.line_offset<chip.lines; line.line_offset++) {
151 xioctl(fd, GPIO_GET_LINEINFO_IOCTL, &line);
152 if (!strcmp(line.name, *toys.optargs)) {
153 printf("%s %d\n", chip.name, line.line_offset);
154 break;
155 }
156 }
157 close(fd);
158 }
159
gpiofind_main(void)160 void gpiofind_main(void)
161 {
162 foreach_chip(gpiofind);
163 }
164
165 #define FOR_gpioinfo
166 #include "generated/flags.h"
167
gpioinfo_fd(int fd)168 static void gpioinfo_fd(int fd)
169 {
170 struct gpiochip_info chip;
171 struct gpioline_info line;
172
173 xioctl(fd, GPIO_GET_CHIPINFO_IOCTL, &chip);
174
175 // gpiochip1 - 8 lines:
176 printf("%s - %d line%s:\n", chip.name, chip.lines, chip.lines==1?"":"s");
177
178 // line 4: "VDD_SD_IO_SEL" "vdd-sd-io" output active-high [used]
179 // We use slightly wider columns for the name and consumer; just wide enough
180 // to show all Raspberry Pi 400 pins without wrapping an 80-column terminal.
181 for (line.line_offset=0; line.line_offset<chip.lines; line.line_offset++) {
182 xioctl(fd, GPIO_GET_LINEINFO_IOCTL, &line);
183 if (*line.name) sprintf(toybuf, "\"%s\"", line.name);
184 else strcpy(toybuf, "unnamed");
185 if (*line.consumer) sprintf(toybuf+64, "\"%s\"", line.consumer);
186 else strcpy(toybuf+64, "unused");
187 printf("\tline %3d:%18s %18s", line.line_offset, toybuf, toybuf+64);
188 printf(" %sput", line.flags&GPIOLINE_FLAG_IS_OUT?"out":" in");
189 printf(" active-%s", line.flags&GPIOLINE_FLAG_ACTIVE_LOW?"low ":"high");
190 if (line.flags&GPIOLINE_FLAG_KERNEL) printf(" [used]");
191 printf("\n");
192 }
193
194 close(fd);
195 }
196
gpioinfo(char * path)197 static void gpioinfo(char *path)
198 {
199 gpioinfo_fd(xopen(path, O_RDWR));
200 }
201
gpioinfo_main(void)202 void gpioinfo_main(void)
203 {
204 int i;
205
206 if (!toys.optc) foreach_chip(gpioinfo);
207 else for (i = 0; toys.optargs[i];i++) gpioinfo_fd(open_chip(toys.optargs[i]));
208 }
209
210 #define FOR_gpioget
211 #include "generated/flags.h"
212
gpioget_main(void)213 void gpioget_main(void)
214 {
215 struct gpiohandle_request req = { .flags = GPIOHANDLE_REQUEST_INPUT };
216 struct gpiohandle_data data;
217 struct gpiochip_info chip;
218 char **args = toys.optargs;
219 int fd, line;
220
221 fd = open_chip(*args);
222 xioctl(fd, GPIO_GET_CHIPINFO_IOCTL, &chip);
223 if (FLAG(l)) req.flags |= GPIOHANDLE_REQUEST_ACTIVE_LOW;
224 for (args++; *args; args++, req.lines++) {
225 if (req.lines >= GPIOHANDLES_MAX) error_exit("too many requests!");
226 line = atolx_range(*args, 0, chip.lines);
227 req.lineoffsets[req.lines] = line;
228 }
229 xioctl(fd, GPIO_GET_LINEHANDLE_IOCTL, &req);
230 xioctl(req.fd, GPIOHANDLE_GET_LINE_VALUES_IOCTL, &data);
231 for (line = 0; line<req.lines; line++)
232 printf("%s%d", " "+(line<1), data.values[line]);
233 xputc('\n');
234 }
235
236 #define FOR_gpioset
237 #include "generated/flags.h"
238
gpioset_main(void)239 void gpioset_main(void)
240 {
241 struct gpiohandle_request req = { .flags = GPIOHANDLE_REQUEST_OUTPUT };
242 char **args = toys.optargs;
243 int fd, value;
244
245 fd = open_chip(*args);
246 if (FLAG(l)) req.flags |= GPIOHANDLE_REQUEST_ACTIVE_LOW;
247 for (args++; *args; args++, req.lines++) {
248 if (req.lines == GPIOHANDLES_MAX) error_exit("too many requests!");
249 if (sscanf(*args, "%d=%d", req.lineoffsets+req.lines, &value) != 2)
250 perror_exit("not LINE=VALUE: %s", *args);
251 req.default_values[req.lines] = value;
252 }
253 xioctl(fd, GPIO_GET_LINEHANDLE_IOCTL, &req);
254 }
255